Autograph Letter Signed ‘J Liebig’, to J.Bass, M.P., Burton on Trent, introducing Mr. Heinrich who wishes to see the Bass brewery, and “sending a new substitute for hops …a product from the manufacture of quinine” and a good preservative. In English. 1 page 9 x 5½ inches, in good condition, one small tear repaired, traces of adhesive on verso only. Munich, 9 August 1869. Justus von Liebig (1803-1873), a discoverer of chloroform, was a German chemist who made major contributions to agricultural and biological chemistry, and worked on the organization of organic chemistry. As a professor, he devised the modern laboratory-oriented teaching method, and for such innovations, he is regarded as one of the greatest chemistry teachers of all time. He is known as the “father of the fertilizer industry” for his discovery of nitrogen as an essential plant nutrient, and his formulation of the Law of the Minimum which described the effect of individual nutrients on crops.